linux-kernel - [tip:perf/core] perf: Remove 64-bit alignment padding from perf_event

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Message-ID: <tip-28009ce4a8130af7260a9271901b4419834ad152@git.kernel.org>
Date:	Fri, 1 Jul 2011 15:19:10 GMT
From:	tip-bot for Richard Kennedy <richard@....demon.co.uk>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	a.p.zijlstra@...llo.nl, richard@....demon.co.uk,
	tglx@...utronix.de, mingo@...e.hu
Subject: [tip:perf/core] perf: Remove 64-bit alignment padding from perf_event_context

Commit-ID:  28009ce4a8130af7260a9271901b4419834ad152
Gitweb:     http://git.kernel.org/tip/28009ce4a8130af7260a9271901b4419834ad152
Author:     Richard Kennedy <richard@....demon.co.uk>
AuthorDate: Tue, 7 Jun 2011 16:33:38 +0100
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Fri, 1 Jul 2011 11:06:32 +0200

perf: Remove 64-bit alignment padding from perf_event_context

Reorder perf_event_context to remove 8 bytes of 64 bit alignment padding
shrinking its size to 192 bytes, allowing it to fit into a smaller slab
and use one fewer cache lines.

Signed-off-by: Richard Kennedy <richard@....demon.co.uk>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/r/1307460819.1950.5.camel@castor.rsk
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 include/linux/perf_event.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index e76a410..2f7b5d4 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -894,8 +894,8 @@ struct perf_event_context {
 	u64				parent_gen;
 	u64				generation;
 	int				pin_count;
-	struct rcu_head			rcu_head;
 	int				nr_cgroups; /* cgroup events present */
+	struct rcu_head			rcu_head;
 };
 
 /*
--
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